They paid for your losses and you (your club) accepted it??? I bet that gave
them a warm and fuzzy feeling toward hams! Good advice about keeping up with
what's happening, though.
--- In Repeater-Builder@yahoogroups.com, Jim Brown w5...@... wrote:
We put a repeater in the equipment room
try this
http://www.princetonimaging.com/scanning/pdfservice.html
--
From: mmoss111 mm...@mindspring.com
Sent: Friday, August 21, 2009 6:46 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Talking about pdf and scanners what
Thanks Eric and Walter.
I just wanted to see what to expect when I hooked this up, and so far it does
only show about 3db gain, which makes sense to overcome the splitter. I was
able to adjust it using the couple of tuning screws to center on the 450 band.
Has a very sharp tuning slope though
There s an outfit on ebay that uses one of these
http://www.nextscan.com/products/flexscan.html
to scan microfiche to pdf for $33.00 a page... (ouch!)
At 16:02 8/21/2009 -0700, you wrote:
Marvin,
I feel your pain. I have many GE manuals on microfiche, and I have been
trying to find a way to
Hope someone may have a program,commshop? What I need to know is what amount of
isolation with duplexers that is required for a GE m2 reciever with .1...@12db
and a m2 pll exciter,100 watt PA on vhf,600kc split?1/2in helix,with 4pole
db224 antenna at 70 ft.
thanks kj4si
Hi
You didn, say Freq. I picked 146.94-146.34 punched in your figures and Got
94.4
Wesley AB8KD
- Original Message -
From: kj4si
To: Repeater-Builder@yahoogroups.com
Sent: Saturday, August 22, 2009 9:54 AM
Subject: [Repeater-Builder] isolation
Hope someone may have
Paul,
1) Yes, DSP-driven, adaptable squelch would be so excellent! Alas, I don't
the the skills to program such a thing. I would probably be able to define the
desired parameters operating modes and be glad to work with someone on that.
What I need to do is hang an audio spectrum
Let's never forget that ANY loss between the antenna and the receiver will
degrade the rx's noise figure. That means feedline, duplexer, cavities,
connectors, Polyphasers, etc.
Noise figure degradation means less sensitivity, period. There's no way to
make up for that EXCEPT with a preamp at
At 8/21/2009 09:47, you wrote:
Hi Skipp,
For our Christmas present to us (my wife and myself), we purchased a Cannon
CanoScan 8800F flatbed scanner. Works really well, and has a USB interface
to our computer. There are buttons on the scanner that allows you to scan
documents and convert to
My CommShop calculates 99.65 dB is required. I'd definitely be looking at a
six-cavity BpBr duplexer for this station.
73, Eric Lemmon WB6FLY
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of kj4si
Sent: Saturday, August
H
How about a mastr ii pll Vhf 147.225/147.825 with db224a @ 270' with 300'
ldf7-50a and 110watts. I am running 45 watts right now.
Thanks
De N5NPO
Norm
- Original Message -
From: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com
To: Repeater-Builder@yahoogroups.com
Other than ordering the software, is there an old-school formula that
can be used for this? I been using the decibel-wheel to convert from
microvolts to dbm.
NORM KNAPP wrote:
H
How about a mastr ii pll Vhf 147.225/147.825 with db224a @ 270' with
300' ldf7-50a and 110watts. I am
I don't know what band Nick is trying to operate on, but my suggestion would
be to get a purpose-built vehicular repeater, like a Motorola PAC-RT, and
operate that way. Maybe Uniden has something similar - I'm only familiar
with Motorola...
FWIW, Nick, the PAC-RT operates on a completely
Tony,
I once chatted with the developer of CommShop for Windows, and learned that
his formulae are based upon a number of assumptions- the most important
being that the repeater is of commercial quality. This translates to GE
Mastr II and Exec II, and Motorola Micor and Mitrek, for example. He
Eric,
Are you sure about your six-cavity recommendation? The MASTR II PLL
exciter has 22 dB less side-band noise than a typical multiplier exciter
- using 600 kHz TX to RX separation. Assuming his preamp isn't driven
into a non-linear region (it shouldn't be), a good 4 cavity duplexer,
like
Tony, Try this one at RB website.
http://www.repeater-builder.com/downloads/download-index.html
--- In Repeater-Builder@yahoogroups.com, Tony KT9AC kt...@... wrote:
Other than ordering the software, is there an old-school formula that
can be used for this? I been using the decibel-wheel to
Kevin,
Nothing about duplexers is for certain. While I agree that a PLL exciter
is inherently less noisy than its multiplier counterpart, I never assume
that it's okay to plan ahead for less than optimum isolation. Some duplexer
designs are known to have better performance than physically
Eric,
You may have missed the point. While your program calculated a
necessary isolation amount of 99.65 dB, using a GE M2 PLL exciter would
dictate 77.65 dB of necessary isolation - which is easily obtainable
with a quality 4 cavity (okay, 4 large cavity) duplexer. While I
certainly
At 8/22/2009 07:49, you wrote:
Let's never forget that ANY loss between the antenna and the receiver will
degrade the rx's noise figure. That means feedline, duplexer, cavities,
connectors, Polyphasers, etc.
In theory, yes. However, if the noise floor (antenna noise temperature) is
much
Kevin,
I agree with your conclusions- provided that the exciter meets your expected
performance. I would never assume that I could automatically subtract 22 dB
from the proposed isolation, merely because it was a PLL exciter, without
knowing for certain that its performance met or surpassed the
Dan Kagabine, the chief engineer at TX-RX systems use to always say that
once you have enough isolation to overcome any desense, then any more is a
waste of money as it does nothing for you. If you only need 70 db then a
100 db duplexer does nothing more for you than a 70 db duplexer.
73
Gary
I acquired an Alpha 1600 and would like to reprogram the home channels (this is
RX enabled only BTW.) I was able to locate a PDF manual for the Alpha 1700
which is almost identical externally, but apparently has some more advanced
features that appear to make it equivalent to a Moto RR spectra.
What I recall about these mobile telephones (at least in NJ when I lived there)
was that they didn't put quarter-wave VHF whips on roof or trunk but used a
genuine coaxial dipole on about a 2 foot long mast installed on a fender. I
guess they felt that a better way.
--John
--- On Fri,
I turn out that use of CP in urban suburban areas results in somewhat more
signal strength on linearly polarized antennas, e.g. vertical whips on cars
straight rod aerials on portable FM radios. Due to preferential scattering of
vertically polarized sigs from typical urban structures, there
Oh, I forgot...circular polarization would be excellent to use on VHF and UHF
repeater. We want the extra signal strength the multipath would be way less;
less deviation 5 kHz vs. 75 kHz means less susceptability to multipath.
Pasternak's Repeater Handbook shows actual results.
--- On Fri,
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